参数资料
型号: PIC16C620A-04/P301
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18
封装: 0.300 INCH, PLASTIC, DIP-18
文件页数: 44/108页
文件大小: 674K
代理商: PIC16C620A-04/P301
PIC16C62X
DS30235G-page 40
Preliminary
1998 Microchip Technology Inc.
7.4
Comparator Response Time
Response time is the minimum time, after selecting a
new reference voltage or input source, before the
comparator output is guaranteed to have a valid level.
If the internal reference is changed, the maximum
delay of the internal voltage reference must be
considered when using the comparator outputs.
Otherwise the maximum delay of the comparators
should be used (Table 12-2 ).
7.5
Comparator Outputs
The comparator outputs are read through the CMCON
register. These bits are read only. The comparator
outputs may also be directly output to the RA3 and RA4
I/O pins. When the CM<2:0> = 110, multiplexors in the
output path of the RA3 and RA4 pins will switch and the
output of each pin will be the unsynchronized output of
the comparator. The uncertainty of each of the
comparators is related to the input offset voltage and
the
response
time
given
in
the
specications.
shows
the
comparator
output
block
diagram.
The TRISA bits will still function as an output
enable/disable for the RA3 and RA4 pins while in this
mode.
Note 1: When reading the PORT register, all pins
congured as analog inputs will read as
a ‘0’. Pins congured as digital inputs will
convert an analog input according to the
Schmitt Trigger input specication.
2: Analog levels on any pin that is dened
as a digital input may cause the input
buffer to consume more current than is
specied.
FIGURE 7-4:
COMPARATOR OUTPUT BLOCK DIAGRAM
D
Q
EN
To RA3 or
RA4 Pin
Bus
Data
RD CMCON
Set
MULTIPLEX
CMIF
Bit
-
+
D
Q
EN
CL
Port Pins
RD CMCON
NRESET
From
Other
Comparator
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